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ABSTRACT

THE FIGURE SHOWS A PROGRAMMING ROUTINE FOR AUTOMATICALLY PROCESSING AN ELECTROCARDIOGRAPH SIGNAL IN A DIGITAL COMPUTER TO DETERMINE WHETHER A REGULARLY SPACED TRAIN OF P-WAVES IS PRESENT IN THE PREVIOUSLY FOUND P-LIKE BUMPS OR WAVES OF THE SIGNAL. THE RESPECTIVE P-TO-P TIME INTERVALS BETWEEN SUCESSIVE P-LIKE WAVES OF THE SIGNAL ARE SEQUENTIALLY COMPARED TO EACH OF THE DIFFERENT P-TO-P TIME INTERVALS PREVIOUSLY STORED IN A TABLE OF P-TO-P TIME INTERVALS. EACH TIME A P-TO-P TIME INTERVAL FAIL TO MATCH, WITHIN A PREDETERMINED DEGREE OF TOLERANCE, INTERVALS PREVIOUSLY STORED IN THE TABLE, IT IS ADDED TO THE TABLE AS A NEW INTERVAL. EACH TIME AN INTERVAL IS ADDED TO THE TABLE, SYNTHESIZED FRACTIONAL SUBINTERVALS THEREOF ARE LIKEWISE COMPARED AND ADDED, IF THEY FAIL TO MATCH. A SEPARATE COUNT IS MAINTAINED OF THE NUMBER OF TIMES EACH INTERVAL IN THE TABLE IS MATCHED. THE COUNT OF THE INTERVAL WHICH IS MATCHED MOST OFTEN IS COMPARED WITH A BELIEVABILITY THRESHOLD TO DETERMINE WHETHER A REGULAR SPACED TRAIN OF P-WAVE IS PRESENT

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oilice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 3, 1974:

T926,014 ROUTINE FOR IDENTIFYING A P-WAVE TRAIN Raymond E. Bonner, Yorktown Heights, N.Y., assignor to International Business Machines Corporation, Armonk, N.Y. Continuation of abandoned application Ser. No. 212,154, Dec. 27, 1971. This application Feb. 28, 1974, Ser.

Int. Cl. G06f 15/42 US. Cl. 444-1 1 Sheet Drawing. 20 Pages Specification STA RI IS IIIIS A REAL M "II" ERVAL (IIOI SYNTHESIZEO) CALCULATE P-P BEIIEVAEILITY THRESH- OLO A5 2/3 I IIOfiOFRSP'WAVES-ZI l II IIAVE ALL STORED P P IIITERVAL IIIIARLE BEEII COMPARED? NO YES ADII ONE TO TRUE CO IIT OF STORED F-P INTERVALS IIAICHEO mm cuum ED w m- ERVALS mom Inner OBTAINED) I5 mm cuunmnuz count OWNED) Lima mu run so OTHER P-Pi DETERMINE VIIIICH P'F DERIVATIVE (112,1/3, V4) TO SYIII'IIESIZE IIEXT AIII) DALCIJLATEIT.

STORE PRESEIILINTERVAL III TABLE. BALCIILAILIISLOMFARISOR ,IHRES VAL'OR ionsmmcnsven |s LARGER, IIIIIQIIZQIJIIBEKQIIO lonlcoums CONSIDER INTERVAL JUST PREPARE IIEXI SIIIIIIESIZEII INTERVAL The figure shows a programming routine for automatically processing an electrocardiograph signal in a digital computer to determine whether a regularly spaced train of P-waves is present in the previously found P-like bumps or waves of the signal. The respective P-to-P time intervals between successive P-like waves of the signal are sequentially compared to each of the different P-to-P time intervals previously stored in a table of P-to-P time intervals. Each time a P-to-P time interval fails to match, within a predetermined degree of tolerance, intervals previously stored in the table, it is added to the table as a new interval. Each time an interval is added to the table, synthesized fractional subintervals thereof are likewise compared and added, if they fail to match. A separate count is maintained of the number of times each interval in the table is matched. The count of the interval which is matched most often is compared with a believability threshold to determine whether a regularly spaced train of P-wavcs is present.

Sept. 3, 1974 R. E. BONNER T925914 ROUTINE FOR IDENTIFY NG A P-WAVE TRAIN Original Filed Dec. 27, 1971 sTART I T I IS PREsENT P-P INTERvAL LARGER THAN /1 130MS? 1 1 NO YES 3 IS THIS ALL OF THE P-P INTERVALS? IS THIS TIRsT P-P INTERVAL CONSIDERED NO YES 55 NO YES CONSIDER NEXT DOES THIS INTERvAL MATCH IwITIIIN P-P INTERVAL 21/ ToLERANcE PPTD) STORED INTERVAL? /15 Q N0 17 YES 25 59 com NExT STORED IsTIIIsAREALP-PINT- CALCULATE P-P RELIEvABILITT THRESH 'NTERVAL ERVAWNOT SYNIHES'ZED) OLD AS Z/SINOL 0F P-wAvEs-2I+1= 19 NO YES THRS I HAVE ALL STORED P-P ADD ONE To TRuE INTERvALs IN TABLE c I I N T T s g g P P 41 IS ToTAL coIINT OFMOST LIKELY I BEENCOMPARED' P-P INTERvAL GREATER TIIAN THRS? JNO YES 2T IRIIIILRRI NO YES IN- 45 ERVALSMATCHED NOT MRAIN P-TRAllNNrlElgaAlHlSP-P (MAT-CH OBTAINED) 51 Is ToTAL cIIIINT+TRIIE couNT A (N0 MATCH OBTAINED) LARGER TIIAN FOR ANY OTHER P-P 25 NO YES 35 IS TABLE OFSTORED P-PINTERVALS STORE THIS p-p A5 MOST FULL LIKELY P-P INTERVAL FOR'RECORD N0 YES 1 l 5 DETERMINE WHICH P-P DERlVATlVE(1/2,1/3,

1/4) To sIINTIIEsIzE NExT AND CALCULATE IT. sToREP EsE IgI T RI A IN A IL l @ALCULA El M A HAVE ALL SYN'THESIZED INTERvALs HOLD IPPTLIIAs 10% OF TOTAL INTER- BEEN CONSIDERED YET /9 VAL 0R 40MS,WH|CHEVER|SLARGER. 0

INITIALIZETRIIEANIIToTALcoIINTs l 11 15 TooNE. CONSIDER INTERVALJUST PREPARENExT SYNTHESIZED INTERVAL INVENTOR RAYMOND E. BONNER TORNEY 

